There has been some interest shown recently in the practical significance of the antipodal focussing in VLF propagation. If the earth and the ionosphere were perfectly concentric spherical surfaces, theory indicates that the amplitude of the field should Topic: Radio waves.
Using the exact series solution for diffraction by a perfectly conducting wedge, numerical results are presented for the structure of the field in the apex region. This provides insight to the nature of electomagnetic fields near a surface discontinuity. Topic: Radio waves.
The radio refractive index can be measured either directly or indirectly. The former method is utilized by radio frequency refractometers; the latter method involves measurement of temperature, pressure and humidity and conversion to refractive index. I Topics: Radio meteorology., Refractive index--Measurement., Radio waves.
A collection of titles and abstracts is presented for articles dealing with the microwave fading that has been observed on tropospheric line of sight paths.Selections are included for related subjects such as:measurement of meteorological factors; spatial Topics: Tropospheric radio wave propagation--Bibliography., Radio waves--Bibliography.